Plaster board



C. R. BIRDSEY.

. PLASTER BOARD.

APPLICATION FILED JAN. 3| 1921.

Patented Feb. 21, 1922.

Wife vUNITED STATES PATENT OFFICE.

CHARLES R. BIRDSEY, OF HINSDALE, ILLINOIS, ASSIGNOR T0 UNITED STATES GYPSUM COMPANY, or CHICAGO,

ILLINOIS, A CORPORATION 0F ILLINOIS.

PLASTER BOARD.

Specification of Letters Patent. Patented Feb, 21, 1922,

original application ed January 2, 1920, Serial No. 348,943. Divided and this application led Ianuary 3, 1921.

To all 'whom it may concern.'

Be it known that I, CHARLES R. lmnsn, a citizen of the United States, residing at Hinsdale, in the county of Du Page and State of Illinois, have invented certain new and useful Improvements in Plaster Board` (Case E-1), of which the following is a description.

My invention belongs to that general class of devices known as plaster board or the like, and relates particularly to an improved board which will be simple, substantial, durable, satisfactory and eficient, and which may be economically and accurately' manufactured. The invention relates particularly to a type of board in which the inclosed plaster, plaster Paris or equivalent plastic material is substantially inclosed on one or more edges, and in which the edges are perfectly formed to conform to a definite specification as to size or angle. Many other; objects and advantages of the construction herein shown and described will be obvious to those skilled in the art from the disclosures herein given. This application is a division of my pending application Serial No. 348,943.

To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like or corresponding parts,

Figure l is a sectional view through a portion of a plaster board embodying the invention; and

Figure 2 is a perspective view of a portion of the board.

Referring' to the drawings 1 represents a body of suitable material, as for example plaster, plaster Paris or any equivalent suitable for the purpose. I prefer to use a material which may be handled in a plastic state during the manufacture of the board, and thereafter be allowed to set or harden. As shown the board 1 is inclosed between covering sheets on opposite faces or sifbs, and inclosed at the side edges. In the particular type of board shown, a covering sheet 2 on one face is wrapped or folded over the edges as at 3 to inclose the same, and then the portions 4 andy wrapped or folded over the Serial No. 434,653.

top face to form the covering sheet at that side. The sheet is preferably of such. a width that the two edges will extend substantially close together, as indicated at 6. I have also shown a strip 7 arranged in the body below the meeting edges. The covering sheet adheres to the body and is caused to adhere oI be bound to the strips 7,'at the edges 4 and 5 by means of the body material 8, which is allowed to flow or be pressed over the same, forming a binder. Obviously, any equivalent securing means may be employed for the purpose.

The edges 3 may be formed at the desired angles, and if desired, the sheet may be scored as at 9-.9 before folding or bending so as to form sharp corners. This, however, is a matter of preference.

It will be noted that'the board is substantially completely inclosed at both sides or faces and edges. The resulting product 1s produced with a straight, smooth edge, and at a desired, perfect angle, the board being uniform in length. The completed product has may advantages, as it has in.

inclosed, the remaining edges may be inclosed in any suitable manner, if so desired. Having thus described my invention, it is obvious that various immaterial modifications may be made in the same Without departing fram the spirit of my invention; hence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts (herein shown and described, or uses mentioned.

That I claim as new and desire to secure by Letters Patent is:

l. A plaster board comprising a body, a cover sheet extending over one face of the body and folded over the edges onto the opposite side of the body with the edges adjacent each other, and a sealing strip arranged over said body at the junctures of said edgeson the interior of the cover sheet.

adjacent each other, and a sealing strip aryranged over seid body at the junctures of said edges on the interior of the cover sheet,

and secured to Suid sheet. at said edge by.

over the edges onto the opposite side of the body andl adhering thereto, with the extreme edges adjacent each other, end a seeling strip arranged over seid body between the body und sheet at the junctures ofsaid edes, said edge's and strip secured together.

n testimony whereof, I' have hereunto signed my naine in the presence of two sub- Scribing witnesses.

'CHARLES R. BIRDSEY.

Witnesses:

Roy W. HILL, l BERTH'A HARTMANN. 

